CN107959120B - Reconfigurable antenna and mobile terminal - Google Patents
Reconfigurable antenna and mobile terminal Download PDFInfo
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- CN107959120B CN107959120B CN201610905770.XA CN201610905770A CN107959120B CN 107959120 B CN107959120 B CN 107959120B CN 201610905770 A CN201610905770 A CN 201610905770A CN 107959120 B CN107959120 B CN 107959120B
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- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
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Abstract
The invention discloses a reconfigurable antenna and a mobile terminal. The reconfigurable antenna comprises an input/output port, a change-over switch, an antenna radiator, at least three feed ground feed change-over terminals, an antenna switch and an active switchable matching network, wherein the input/output port is positioned at the front end of radio frequency; the change-over switch is connected with at least three antenna switches; the selector switch is used for switching at least three antenna switches to be connected with the input/output port of the radio frequency front end; the antenna switch is used for switching a switch or an active switchable matching network connected with the antenna switch to be connected with a feed ground switching end; the feed ground switching end is a feed end when communicated with the input/output port of the radio frequency front end. The active antenna can flexibly switch the feed end position of the antenna, flexibly switch the state of the radiating body of the antenna along with the working frequency/frequency band, and eliminate the dependence on the physical shape of the specific radiating body to the maximum extent.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a reconfigurable antenna and a mobile terminal.
Background
With the popularization of 4G intelligent terminals and the development trend of the next generation of 5G intelligent terminals, the existing and future intelligent terminals will face the dilemma and challenge of higher and higher requirements on the antenna frequency range coverage. At present, fragmentation of 4G frequency bands of various countries around the world is serious, the 4G frequency band defined in the current 3GPP specification exceeds 40 frequency bands, a mobile intelligent terminal product needs to be made into a global version and realize global seamless roaming, and the requirement on the frequency band coverage range of a terminal antenna is very challenging, and full-band coverage in frequency ranges of '698-960 MHz and 1710-2690 MHz' increasingly becomes the current trend or the basic requirement in the future.
The antenna environment is more and more challenging, making the implementation of antenna frequency band coverage and other related performance more difficult and challenging. The smart terminal is increasingly thin, devices such as a display screen/a touch screen/a USB/Speaker/AV-Jack/a motor/front and back cameras/batteries occupy effective space of the antenna, and particularly in a hot environment, an all-metal mobile phone ID (industrial design) makes the antenna environment more difficult and challenging. One technological break in recent years is the active antenna concept in order to make the antenna bandwidth cover as much as possible of the global roaming frequency band. In the existing active antenna technology, an active antenna switch or an antenna tuner (antenna tuner) is introduced into an antenna matching network to switch different impedance matching networks (states) of an antenna along with different frequencies/frequency bands, so as to improve the bandwidth coverage of the antenna.
The existing concept architecture of the active antenna includes the following three types: first, as shown in fig. 1, a first active switchable matching network 60 that is flexibly switched according to the working frequency/frequency band is introduced into the ground feeding end 40 of the antenna; secondly, as shown in fig. 2, a first active switchable matching network 60 which is flexibly switched with the working frequency/frequency band is introduced into the feeding end 30 of the antenna; thirdly, as shown in fig. 3, a first active switchable matching network 60 and a second active switchable matching network 61 which are flexibly switched according to the working frequency/frequency band are respectively introduced into the feeding end 30 and the feeding end 40. In fig. 1-3, the feeding terminal 30 is connected to the input/output port 20 of the rf Front End (Front End Module, FEM).
In the existing active antenna technology, the structure of the antenna is shown in fig. 1, fig. 2 or fig. 3, and the common point is that the feeding end 30 of the antenna is single and fixed, and the matching state of the antenna is flexibly switched along with the working frequency/frequency band only by introducing the first active switchable matching network 60 and the second active switchable matching network 61 into the feeding end 30 and the feeding ground end 40 respectively or simultaneously; however, the state of the antenna radiator is fixed, which means that the active antenna is fixed and invariable for all operating frequencies/frequency bands, thereby affecting the operating frequencies/frequency bands of the active antenna, which is the most important limitation point of the existing active antenna technology. The state of the antenna radiator is fixed and unchanged, and the following two defects exist:
first, the state of the antenna radiator is fixed, which limits the application effect of the existing active antenna technology (i.e. only the antenna matching state is flexibly switched with the working frequency/frequency band), especially the coverage of the switchable bandwidth. In a certain main operating frequency interval, if the initial antenna bandwidth/efficiency/impedance interval performance exhibited by the antenna radiator state is optimal (generally speaking, in this frequency interval, if the equivalent electrical length of the antenna radiator 10 itself is close to a quarter wavelength, each initial performance of the antenna is optimal), the antenna bandwidth improvement effect of the first active switchable matching network 60 and the second active switchable matching network 61 can be exerted to the maximum extent, but since the antenna radiator state is fixed and unchanged, this antenna radiator state is necessarily meant, in other main operating frequency intervals, the initial antenna bandwidth/efficiency/impedance interval performance exhibited by the antenna radiator state is relatively poor, even if a variable matching network flexibly switched with different operating frequencies/frequency bands is introduced, the matched impedance bandwidth is relatively narrow, the adjustment range is relatively limited. Particularly, in the case of a relatively poor antenna environment (such as an all-metal housing), the overall performance of the initial antenna bandwidth/efficiency/impedance interval is relatively poor in each frequency interval, and by introducing the first active switchable matching network 60 and the second active switchable matching network 61 which are flexibly switched with different operating frequencies/frequency bands, although the coverage of the antenna bandwidth can be improved, the effective adjustment range is relatively limited, and it is very difficult to achieve any ideal full-frequency-band effective coverage.
Secondly, the debugging of the specific radiator physical shape (i.e. the antenna pattern) of the antenna radiator 10 still has dependency, which is not favorable for realizing the simplification and standardization of the antenna radiator 10 structure and the one-version setting requirement in the product development. In the conventional active antenna technology, in order to implement a required wide bandwidth matching effect by matching with the first active switchable matching network 60 and the second active switchable matching network 61, a complex physical shape of a radiator (i.e., an antenna pattern) is often required to be simultaneously adjusted in product development, so as to optimize or compromise initial antenna bandwidth/efficiency/impedance interval performance of the antenna radiator 10 in a plurality of main operating frequency intervals.
Disclosure of Invention
The invention aims to solve the technical problem of providing a reconfigurable antenna and a mobile terminal aiming at the defects that the antenna radiator in the existing active antenna is single and fixed.
The technical scheme adopted by the invention for solving the technical problems is as follows: a reconfigurable antenna comprises an input/output port at the front end of a radio frequency, a change-over switch connected with the input/output port, an antenna radiator, at least three feed ground feed change-over terminals arranged on the antenna radiator, an antenna switch connected with each feed ground feed change-over terminal, and an active switchable matching network connected with each antenna switch; the change-over switch is connected with at least three antenna switches;
the change-over switch is used for switching at least three antenna switches to be connected with the input/output port; each antenna switch is used for switching the switch or the active switchable matching network connected with the antenna switch to be connected with the feed ground switching end; the feed ground feed switching end is a feed end when communicated with the input/output port of the radio frequency front end, and is a ground feed end when not communicated with the input/output port of the radio frequency front end.
Preferably, the change-over switch is a single-pole multi-throw switch, and a common input end of the change-over switch is connected with the input/output port; and the multi-path output end of the change-over switch is respectively connected with at least three antenna switches.
Preferably, the antenna switch is a single-pole multi-throw switch, and a common input end of the antenna switch is connected with the feed ground switching end; one output end of the antenna switch is connected with the change-over switch, and the other output ends of the antenna switch are connected with the active switchable matching network.
Preferably, the active switchable matching network comprises a plurality of inductors or capacitors connected in parallel, each of the inductors or capacitors being connected to one of the remaining output terminals of the antenna switch.
Preferably, at least three of the feed ground switching terminals are disposed on the antenna radiator at intervals.
Preferably, a passive matching network is further included connected between each said diverter switch and said antenna switch.
Preferably, the passive matching network comprises an L-type passive matching network, a T-type passive matching network or a pi-type passive matching network.
Preferably, the L-type passive matching network comprises a first inductor and a second inductor, wherein two ends of the first inductor are respectively connected with a change-over switch and an antenna switch, one end of the second inductor is connected between the first inductor and the change-over switch, and the other end of the second inductor is grounded.
Preferably, the L-type passive matching network comprises a third inductor and a capacitor, two ends of the capacitor are respectively connected with the change-over switch and the antenna switch, one end of the third inductor is connected between the capacitor and the antenna switch, and the other end of the third inductor is grounded.
The invention also provides a mobile terminal comprising the reconfigurable antenna.
Compared with the prior art, the invention has the following advantages: in the reconfigurable antenna and the mobile terminal provided by the invention, the reconfigurable antenna leads the matching state of the antenna to be flexibly switched along with the working frequency/frequency band by introducing the active switchable matching network, so that the resonant frequency of the antenna is more flexibly and easily switched/shifted along with the working frequency/frequency band, and the range is wider; at least three feed ground switching ends are arranged on the antenna radiating body and connected with an input/output port of the radio frequency front end by switching the at least three feed ground switching ends, so that the feed end position of the antenna can be flexibly switched, the state of the antenna radiating body is also flexibly switched along with the working frequency/frequency band, the resonant frequency of the antenna is more flexibly and easily switched/shifted along with the working frequency/frequency band, the range is wider, and the dependence on the physical shape of a specific radiating body is eliminated to the maximum extent.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic diagram of an architecture of a conventional active antenna in which an active switchable matching network is introduced into a ground feed terminal.
Fig. 2 is a schematic diagram of an architecture of a conventional active antenna in which an active switchable matching network is introduced into a feeding end.
Fig. 3 is a schematic diagram of an architecture in which an active switchable matching network is introduced into a ground feed end and a feed end of a conventional active antenna.
Fig. 4 is a schematic diagram of an architecture of a reconfigurable antenna according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a state of the reconfigurable antenna shown in fig. 4.
Fig. 6 is an architecture diagram of another state of the reconfigurable antenna shown in fig. 4.
Fig. 7 is an architectural diagram of yet another state of the reconfigurable antenna shown in fig. 4.
Fig. 8 is a schematic diagram of an architecture of a reconfigurable antenna according to an embodiment of the invention.
Fig. 9 is a schematic diagram of a specific architecture of the reconfigurable antenna shown in fig. 8.
Fig. 10 is a return loss plot for the simulation of fig. 9 using a first feed ground switch.
Fig. 11 is a return loss plot for the simulation of fig. 9 using a second feed-fed switched terminal.
Fig. 12 is a return loss plot of the states of fig. 9 eventually merged together.
In the figure: 10. an antenna radiator; 11. an antenna main floor; 20. an input-output port; 30. a feed end; 40. a first ground feed terminal; 41. a second ground feed terminal; 50. a first feed-to-ground switching port; 51. a second feed ground switching port; 52. a third feed ground switching port; 5n, an nth feed ground switching port; 60. a first active switchable matching network; 61. a second active switchable matching network; 62. a third active switchable matching network; 6n, nth active switchable matching network; 70. a switch; 80. a first antenna switch; 81. a second antenna switch; 82. a third antenna switch; 8n, an nth antenna switch; 90. a first passive matching network; 91. a second passive matching network; 9n, nth passive matching network.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 4-7 show the architecture schematic diagram of the reconfigurable antenna according to an embodiment. As shown in fig. 4, the reconfigurable antenna includes an input/output port 20 at a radio frequency front end, a switch 70 connected to the input/output port 20, an antenna radiator 10, at least three feeding ground switching terminals disposed on the antenna radiator 10, an antenna switch connected to each feeding ground switching terminal, and an active switchable matching network connected to each antenna switch, where the switch 70 is connected to at least three antenna switches.
In this embodiment, three feeding ground switching terminals are provided, namely, a first feeding ground switching terminal 50, a second feeding ground switching terminal 51 and a third feeding ground switching terminal 52. The first feeding ground switching end 50, the second feeding ground switching end 51 and the third feeding ground switching end 52 are arranged on the reconfigurable antenna at intervals and are sequentially arranged along the length direction of the reconfigurable antenna. Accordingly, the antenna switch includes a first antenna switch 80 connected to the first feeding ground switching terminal 50, a second antenna switch 81 connected to the second feeding ground switching terminal 51, and a third antenna switch 82 connected to the third feeding ground switching terminal 52. The active switchable matching network comprises a first active switchable matching network 60 connected to a first antenna switch 80, a second active switchable matching network 61 connected to a second antenna switch 81, and a third active switchable matching network 62 connected to a third antenna switch 82. The switch 70 is connected to the first antenna switch 80, the second antenna switch 81, and the third antenna switch 82, and is used for switching the connection between the input/output port 20 and the first antenna switch 80, the second antenna switch 81, or the third antenna switch 82. The first antenna switch 80 is used to switch the first feeding ground switch terminal 50 to connect with the switch 70 or the first active switchable matching network 60. The second antenna switch 81 is used for switching the second feeding ground switching terminal 51 to connect with the switch 70 or the second active switchable matching network 61. The third antenna switch 82 is used to switch the third feed ground switch terminal 52 to connect with the switch 70 or the third active switchable matching network 62.
In the reconfigurable antenna provided by this embodiment, a first feeding ground switching terminal 50, a second feeding ground switching terminal 51, and a third feeding ground switching terminal 52 are led out from a single and fixed antenna radiator 10. The first feeding ground switching terminal 50 is connected to the first antenna switch 80, the second feeding ground switching terminal 51 is connected to the second antenna switch 81, and the third feeding ground switching terminal 52 is connected to the third antenna switch 82. The first antenna switch 80, the second antenna switch 81 and the third antenna switch 82 can be selectively switched to the switch 70 or to the first active switchable matching network 60, the second active switchable matching network 61 or the third active switchable matching network 62, respectively, under software control. Further, the switch 70 is switchably connected to the first feeding ground switching terminal 50, the second feeding ground switching terminal 51 and the third feeding ground switching terminal 52 under the control of software, so as to determine the position of the feeding terminal 30 of the reconfigurable antenna; and, the common input terminal of the switch 70 is always connected to the input/output port 20 of the rf front end. The switching state combination of the switch 70, the first antenna switch 80, the second antenna switch 81 and the third antenna switch 82 can realize the purpose of flexibly switching the position of the feeding terminal 30 of the antenna along with the working frequency/frequency band, and the feeding terminal 30 at different positions of the antenna radiator 10 is considered to have different equivalent antenna lengths and thus different equivalent radiation modes, thereby equivalently realizing the purpose of flexibly switching the state of the antenna radiator along with the working frequency/frequency band.
In fig. 4-7, the upper end of the antenna radiator 10 is shown with an arrow in a diagonal line, indicating that the state of the antenna radiator is variable. The first feeding ground-feeding switching end 50, the second feeding ground-feeding switching end 51 and the third feeding ground-feeding switching end 52 are disposed at an interval on the antenna radiator 10, and the first feeding ground-feeding switching end 50, the second feeding ground-feeding switching end 51 and the third feeding ground-feeding switching end 52 are the feeding end 30 when communicating with the input/output port 20 of the rf front end, and are the ground-feeding end when not communicating with the input/output port 20 of the rf front end. When the switch 70 and the first antenna switch 80 of the same feed circuit are turned on simultaneously, the first feeding ground switching end 50 is connected to the input/output port 20 of the rf front end, the first feeding ground switching end 50 is the feeding end 30, the second feeding ground switching end 51 and the third feeding ground switching end 52 are the first feeding ground end 40 and the second feeding ground end 41, respectively, and the antenna radiator state is as shown in fig. 5. When the switch 70 and the second antenna switch 81 of the same feed circuit are turned on simultaneously, the second feeding ground switching terminal 51 is connected to the input/output port 20 of the rf front end, the second feeding ground switching terminal 51 is the feeding terminal 30, the first feeding ground switching terminal 50 and the third feeding ground switching terminal 52 are the first feeding ground terminal 40 and the second feeding ground terminal 41, respectively, and the antenna radiator state is as shown in fig. 6. When the switch 70 and the third antenna switch 82 of the same feed circuit are turned on simultaneously, the third feeding ground switching terminal 52 is connected to the input/output port 20 of the rf front end, the third feeding ground switching terminal 52 is the feeding terminal 30, the first feeding ground switching terminal 50 and the second feeding ground switching terminal 51 are the first feeding ground terminal 40 and the second feeding ground terminal 41, respectively, and the antenna radiator state is as shown in fig. 7.
When the switch 70 and the first antenna switch 80 of the same feed circuit in the reconfigurable antenna shown in fig. 4 are simultaneously turned on, the first feed ground switch 50 is connected to the input/output port 20 of the rf front end, the first feed ground switch 50 is the feed terminal 30, the second feed ground switch 51 and the third feed ground switch 52 are the first feed ground terminal 40 and the second feed ground terminal 41, respectively, and the antenna state thereof is shown in fig. 5, in a specific operating frequency range f1 (e.g., low frequency band L B: 698-960 MHz), the antenna radiator state is marked as antenna radiator state f1, in which the position of the first feed ground switch 50 is the antenna feed position, i.e., the antenna feed terminal 30, the antenna output terminal 30 is the antenna, under software control, the switch 70 is connected to the first antenna switch 80, the output terminal of the first antenna switch 80 is switched to be connected to the switch 70, so that the first feed ground switch 50 is the antenna feed terminal 30, the second antenna switch 81 is connected to the second antenna switch 80, the switch 70 is connected to the second feed ground switch 82, the switch 70, the switch 82, the antenna switch1The antenna radiator state is correspondingly identified as antenna radiator state f 1.
When the switch 70 and the second antenna of the same feed path in the reconfigurable antenna shown in fig. 4When the switches 81 are simultaneously turned on, the second feeding ground switch 51 is connected to the input/output port 20 of the rf front end, the second feeding ground switch 51 is the feeding terminal 30, the first feeding ground switch 50 and the third feeding ground switch 52 are the first feeding ground terminal 40 and the second feeding ground terminal 41, respectively, and the antenna radiator state thereof is as shown in fig. 6. in a specific operating frequency range f2 (for example, the middle frequency range MB: 1710-2170 MHz), the antenna radiator state thereof is labeled as the antenna radiator state f2, in which the second feeding ground switch 51 is located at the antenna feeding position, i.e., the feeding terminal 30 of the antenna, under software control, the output of the switch 70 is switched to the second antenna switch 81, the output of the second antenna switch 81 is switched to the switch 70, so that the second feeding ground switch 51 is the antenna radiator state f 30, the output of the third antenna switch 82 is switched to the third active switchable matching network 62, when the third feeding ground switch 82 is connected to the first feeding ground switch 51, the second feeding ground switch 80 f, so that the antenna feeding ground switch 62 is located at the antenna feeding ground terminal 70, the antenna feeding ground switch 62, the antenna switch 82 is switched to the antenna matching network 62, so that the antenna matching network 80 is located at the antenna feeding ground switch 62, the antenna matching network can be switched to the antenna matching network switch 62, and the antenna matching network switch 62, when the antenna matching network can be switched to the antenna matching network switch 62, the antenna matching network switch 80, the antenna switch, the antenna2(equivalent length is here understood to be approximately a two-terminal branch L21And L22Equivalent length of parallel) whose antenna radiator state is correspondingly identified as antenna radiator state f 2.
When the switch 70 and the third antenna switch 82 of the same feed circuit in the reconfigurable antenna shown in fig. 4 are turned on simultaneously, the third feeding ground switch 52 is connected to the input/output port 20 of the rf front end, and the third feeding ground switch 52 isThe antenna comprises a feed terminal 30, a first feed ground switching terminal 50 and a second feed ground switching terminal 51, which are a first feed ground terminal 40 and a second feed ground terminal 41, respectively, and the antenna radiator state is as shown in fig. 7. in a specific operating frequency range f3 (e.g., high frequency band HB:2170 MHz-2690 MHz), the antenna radiator state is labeled as antenna radiator state f3, in which the position of the third feed ground switching terminal 52 is the antenna feed position, i.e., the feed terminal 30 of the antenna, under software control, the output terminal of the switch 70 is switched to the third antenna switch 82, the output terminal of the third antenna switch 82 is switched to the switch 70, so that the third feed ground switching terminal 52 is the feed terminal 30. the output terminal of the first antenna switch 80 is switched to the first active switchable matching network 60, in which the first feed ground switching terminal 50 connected to the first antenna switch 80 is the first feed ground terminal 40, so that the first active matching network 60 is switched to a suitable fixed inductance/ground matching terminal 33, and the second feed ground switching terminal 81 is switched to a second antenna radiator state, such that the antenna radiator state covers a frequency range of the antenna radiator state of the antenna radiator 82, e.g., the antenna radiator state is switched to cover a frequency range of the antenna radiator state of the antenna radiator 60, such as a frequency range of the antenna radiator 60, a frequency range of the antenna switch 73 f, which is easily switchable antenna switch 73 f, which is equivalent frequency range of the antenna switch 73, which is equivalent antenna switch, which is equivalent frequency range of the antenna switch 73 f, which is equivalent frequency range of the3(equivalent length is here understood to be approximately a two-terminal branch L31And L32Equivalent length of parallel) whose antenna radiator state is correspondingly identified as antenna radiator state f 3.
Fig. 8 and 9 show schematic diagrams of the architecture of the reconfigurable antenna in another embodiment. As shown in fig. 8 and 9, the reconfigurable antenna includes an antenna main floor 11, an input/output port 20 disposed on the antenna main floor 11 and located at a radio frequency front end, a switch 70 connected to the input/output port 20 at the radio frequency front end, an antenna radiator 10, n feed-ground switching terminals disposed on the antenna radiator 10, n antenna switches, n active switchable matching networks, n or n-1 passive matching networks. Each antenna switch is connected with a feed ground switching end and an active switchable matching network.
As shown in fig. 8, the n feeding ground switching terminals are the first feeding ground switching terminal 50, the second feeding ground switching terminal 51 … …, and the nth feeding ground switching terminal 5n, respectively. The first feeding ground switching terminal 50 and the second feeding ground switching terminal 51 … … are arranged on the reconfigurable antenna at intervals of the nth feeding ground switching terminal 5n, and are sequentially ordered along the length direction of the reconfigurable antenna. Accordingly, the n antenna switches include a first antenna switch 80 connected to the first feeding ground switching terminal 50, and an nth antenna switch 8n connected to the nth feeding ground switching terminal 5n and a second antenna switch 81 … … connected to the second feeding ground switching terminal 51. The N active switchable matching networks include a first active switchable matching network 60 connected to the first antenna switch 80, a second active switchable matching network 61 … … connected to the second antenna switch 81, and an nth active switchable matching network 6N connected to the nth antenna switch 8N. The switch 70 is connected to the first antenna switch 80 through a first passive matching network 90, the switch 70 is connected … … to the second antenna switch 81 through a second passive matching network 91, and the switch 70 is connected to the nth antenna switch 8n through an nth passive matching network 9 n. It is understood that a passive matching network (e.g., the first passive matching network 90 and the second passive matching network 91 in fig. 9) may be provided between the switch 70 and the n antenna switches, or no passive matching network (e.g., between the switch 70 and the n antenna switch 8n in fig. 9) may be provided. As shown in fig. 8, the first antenna switch 80 is used to switch the first feeding ground switching terminal 50 to connect with the first passive matching network 90 or the first active switchable matching network 60. The second antenna switch 81 is used for switching the second feeding ground switching terminal 51 to connect with the second passive matching network 91 or the second active switchable matching network 61. The nth antenna switch 8n is used for switching the nth feed ground switching terminal 5n to be connected with the nth passive matching network 9n or the nth active switchable matching network 6 n.
In the reconfigurable antenna provided by this embodiment, the first feeding ground-feeding switching end 50 and the second feeding ground-feeding switching end 51 … … are disposed on the antenna radiator 10 at intervals, and the first feeding ground-feeding switching end 50 and the second feeding ground-feeding switching end 51 … … are the feeding end 30 when the nth feeding ground-feeding switching end 5n is communicated with the input/output port 20 of the radio frequency front end, and are the feeding ends when not communicated with the input/output port 20 of the radio frequency front end. That is, when the switch 70 and the first antenna switch 80 of the same feed circuit are turned on simultaneously, the first feeding ground switching end 50 on the antenna radiator 10 is connected to the input/output port 20 of the rf front end through the first antenna switch 80, the first passive matching network 90 and the switch 70, so that the first feeding ground switching end 50 is the true feeding end 30 of the reconfigurable antenna, and the second feeding ground switching end 51 … … is the nth feeding ground switching end 5 n. Similarly, the second feeding ground switching terminal 51 … …, the nth feeding ground switching terminal 5n is the feeding terminal 30 when the second antenna switch 81 … …, the nth antenna switch 8n and the switching switch 70 are turned on simultaneously.
In particular, the antenna radiator 10 may not rely on a particular or complex radiator physical shape to bring the antenna initial resonance to the appropriate frequency range. The antenna radiator 10 in this embodiment may be a simple fixed elongated flat iron sheet of an appropriate length, a copper-plated FPC, or a common wire, and the frequency range of the initial resonance of the antenna may be adjusted by the feeding position on the antenna.
The first feed ground switch terminal 50, the second feed ground switch terminal 51 … …, the nth feed ground switch terminal 5n are disposed at different positions of the antenna radiator 10. It will be appreciated that the number of first feed ground switching terminals 50, second feed ground switching terminals 51 … … nth feed ground switching terminals 5n leading from the antenna radiator 10 can be extended to theoretically any number n, but generally 3 feed ground switching terminals can substantially meet the requirements and ensure circuit complexity and cost within an acceptable range. By switching the first feeding ground switching terminal 50 and the second feeding ground switching terminal 51 … …, the nth feeding ground switching terminal 5n serves as the actual feeding terminal 30 of the antenna radiator 10, which not only determines the different equivalent lengths of the antenna radiator 10 and the initial resonant frequency range of the antenna radiator 10, but also determines the different radiation modes of the antenna radiator 10 corresponding to different states of the antenna radiator 10.
The first antenna switch 80 and the second antenna switch 81 … … are single-pole multi-throw switches, and the nth antenna switch 8n is a single-pole multi-throw switch. The common input ends of the first antenna switch 80 and the second antenna switch 81 … …, the nth antenna switch 8n are respectively connected to the first feeding ground switching end 50 and the second feeding ground switching end 51 … …, the nth feeding ground switching end 5n arranged on the antenna radiator 10; one output end of the first antenna switch 80 and the nth antenna switch 8n of the second antenna switch 81 … … is connected to the switch 70, and the other output ends are respectively connected to the first active switchable matching network 60 and the nth active switchable matching network 6n of the second active switchable matching network 61 … …. In this embodiment, the first antenna switch 80 and the second antenna switch 81 … … are n-th antenna switches 8n, which are single-pole m-throw switches, where the size of m depends on the number of desired switching states, and the value of m is generally 4 (as shown in fig. 9) in consideration of circuit complexity and cost. The common input terminals of the first antenna switch 80 and the second antenna switch 81 … …, the nth antenna switch 8n (single-pole m-throw switch) are respectively connected with the corresponding first feeding ground switching terminal 50 and the second feeding ground switching terminal 51 … …, the nth feeding ground switching terminal 5n, and one of the m output terminals is connected to the first passive matching network 90 and the second passive matching network 91 … …, the nth passive matching network 9n on the corresponding feed (as shown in fig. 8); the remaining m-1 outputs are connected to the first active switchable matching network 60, the second active switchable matching network 61 … …, and the nth active switchable matching network 6 n. Under software control, the passage combination state of the first antenna switch 80, the second antenna switch 81 … …, the nth antenna switch 8n and the changeover switch 70 can be controlled. It is understood that if any of the first feeding ground switch terminal 50 and the second feeding ground switch terminal 51 … … the nth feeding ground switch terminal 5n is not required to be the feeding terminal 30, but only serves as a feeding terminal connected to the first active switchable matching network 60 and the second active switchable matching network 61 … … the nth active switchable matching network 6n, and m-1 output terminals of the corresponding first antenna switch 80 and the corresponding second antenna switch 81 … … the nth antenna switch 8n can be connected to the first active switchable matching network 60 and the corresponding second active switchable matching network 61 … … the nth active switchable matching network 6 n.
As shown in fig. 8 and 9, the first active switchable matching network 60, the second active switchable matching network 61 … …, the nth active switchable matching network 6n includes a plurality of inductors/capacitors connected in parallel, each of which is connected to an output of the first antenna switch 80, the second antenna switch 81 … …, the nth antenna switch 8 n. As shown in fig. 8, the first active switchable matching network 60 includes inductors/capacitors Z respectively connected to m-1 outputs of the first antenna switch 8012，Z13，..Z1(m-1)The second active switchable matching network 61 includes an inductor/capacitor Z connected to m-1 output terminals of the second antenna switch 81, respectively22，Z23，..Z2(m-1)The nth active switchable matching network 6n includes inductors/capacitors Z respectively connected to m output terminals of the nth antenna switch 8nn2，Zn3，..Zn(m-1). Under the control of software, the matching state of the antenna can be flexibly switched along with the working frequency/frequency band, so that the resonant frequency of the antenna deviates within a required range around the initial resonant frequency of the antenna, and all required frequency bands are covered.
As shown in fig. 8 and 9, the first passive matching network 90 and the second passive matching network 91 … …, the nth passive matching network 9n are respectively disposed between the switch 70 and the first antenna switch 80 and the second antenna switch 81 … …, the nth antenna switch 8n to further optimize the initial resonant frequency/bandwidth of the antenna, the network architecture of the passive matching network may employ a conventional L-type passive matching network, a T-type passive matching network or a pi-type passive matching network, the first passive matching network 90 and the second passive matching network 91 … …, the nth passive matching network 9n is different from the first active switchable matching network 60 and the second active switchable matching network 61 … …, the nth active switchable matching network 6n in that the passive matching networks are passive and the states of the passive matching networks are not switched with the operating frequency/frequency band.
The change-over switch 70 is a single-pole multi-throw switch, and the common input end of the change-over switch 70 is connected with the input/output port 20 of the radio frequency front end; the multi-path output end of the switch 70 is connected to the first antenna switch 80, the second antenna switch 81 and the third antenna switch 82 (as shown in fig. 4); alternatively, the multiple output terminals of the switch 70 are connected to the first passive matching network 90 and the nth passive matching network 9n of the second passive matching network 91 … …, respectively. Specifically, the switch 70 is also a single-pole m-throw switch (m is a size depending on the number of different feed paths desired to be utilized, and m is 2 or 3, considering circuit complexity and cost), the common input end of the switch 70 is connected to the input/output port 20 of the rf front end, and the m output ends thereof are respectively connected to the first passive matching network 90 and the second passive matching network 91 … …, and the nth passive matching network 9n on different feed paths or different feed paths. Under the control of software, the first feeding ground switching end 50 and the second feeding ground switching end 51 … … are switched and selected to serve as the nth feeding ground switching end 5n of the antenna under the current frequency/frequency band corresponding to different working frequencies/frequency bands, so as to determine which antenna radiator state is adopted.
As shown in fig. 8, the operation principle of the reconfigurable antenna can be described in general as follows:
for example, in the operating frequency range f1, the switch 70 is controlled by software to be turned on with the first antenna switch 80 to switch to the feed circuit where the first passive matching network 90 is located, so that the first feed ground switching end 50 is the feed end 30; the operation principle of the reconfigurable antenna is similar to that of fig. 5. The second antenna switch 81 … … nth antenna switch 8n is respectively conducted with the second active switchable matching network 61 … … nth active switchable matching network 6n, remaining in a fixed state throughout the f1 frequency range; under the control of software, the frequency range f1 is further subdivided into sub-frequency ranges f11, f12 and f13 … … f1(m-1), and the states are sequentially switched to different states respectively corresponding to Z22，Z23，..Z2(m-1)"and" Zn2，Zn3，..Zn(m-1)"certain inductance/capacitance of. In the operating frequency range f1, the first feed ground switch 50 serves as the feed terminal 30 of the reconfigurable antenna in this operating frequency range f1, and is identified as the antenna radiator state S corresponding to a state of the antenna radiator 10L1(ii) a Correspondingly, the second feeding ground switching terminal 51 … … is the nth feeding groundThe switching terminals 5n are respectively used as ground feeding terminals of the reconfigurable antenna; at this time, the second feeding ground switching terminal 51 … …, the nth feeding ground switching terminal 5n is respectively communicated with the corresponding second active switchable matching network 61 … …, the nth active switchable matching network 6n, under software control, the antenna operating frequency can be flexibly shifted in the operating frequency range f1, and full-band coverage in the frequency range f1 is achieved.
For example, in the operating frequency range f2, the switch 70 is controlled by software to be turned on with the second antenna switch 81 to switch to the feed path where the second passive matching network 91 is located, so that the second feed ground switching end 51 is the feed end 30; the operation principle of the reconfigurable antenna is similar to that of fig. 6. The fixed state is maintained throughout the f2 frequency range, the first antenna switch 80 … … nth antenna switch 8n is respectively conducted with the first active switchable matching network 60 … … nth active switchable matching network 6 n; under the control of software, the frequency range f2 is further subdivided into sub-frequency ranges f21, f22 and f23 … … f2(m-1), and the states are sequentially switched to different states respectively corresponding to Z12，Z13，..Z1(m-1)"and" Zn2，Zn3，..Zn(m-1)"certain inductance/capacitance of. In the operating frequency range f2, the second feed ground switching terminal 51 serves as the feed terminal 30 of the reconfigurable antenna in this operating frequency range f2, and is identified as the antenna radiator state S in response to the second state of the antenna radiator 10L2(ii) a Accordingly, the first feeding ground switching terminal 50 … … nth feeding ground switching terminal 5n respectively serves as a ground feeding terminal of the reconfigurable antenna; at this time, the first feeding ground switching terminal 50 … … and the nth feeding ground switching terminal 5n are respectively communicated with the corresponding first active switchable matching network 60 … … and the nth active switchable matching network 6n, so that the antenna operating frequency can be flexibly shifted in the operating frequency range f2 under the software control, and the full-band coverage in the frequency range f2 is achieved.
For example, in the working frequency range fn, the path between the switch 70 and the nth antenna switch 8n is controlled by software to switch to the feed path where the nth passive matching network 9n is located, so that the nth feed ground feed switching end 5n is the feed end 30; at this time, the reconfigurable antennaThe principle of operation of the wire is similar to that of figure 7. The fixed state is maintained in the whole fn frequency range, and the first antenna switch 80 and the second antenna switch 81 are respectively conducted with the first active switchable matching network 60 and the second active switchable matching network 61; under software control, the frequency range fn is further subdivided into sub-frequency ranges fn1, fn2 and fn3 … … fn (m-1), and the states are sequentially switched to different states, namely Z and Z respectively12，Z13，..Z1(m-1)"and" Z22，Z23，..Z2(m-1)"certain inductance/capacitance of. In the operating frequency range fn, the nth feed ground switching terminal 5n serves as the feed terminal 30 of the reconfigurable antenna in this operating frequency range f3, and is identified as the antenna radiator state S corresponding to the nth state of the antenna radiator 10Ln(ii) a Accordingly, the first feeding ground switching terminal 50 and the second feeding ground switching terminal 51 are divided into ground feeding terminals of the antenna; at this time, the first feeding ground-feeding switching terminal 50 and the second feeding ground-feeding switching terminal 51 are communicated with the corresponding first active switchable matching network 60 and the second active switchable matching network 61, so that the antenna operating frequency can be flexibly shifted within the operating frequency range fn under the software control, and the full-band coverage within the frequency range fn is achieved.
In summary, under software control, the antenna resonant frequency can be flexibly shifted within the entire frequency range of f1/f2+ … … + fn, so as to finally achieve full-band coverage within the entire operating band. According to the reconfigurable antenna provided by the embodiment, by introducing the plurality of feed terminals 30 and the scheme of flexibly switching the n feed ground feed switching terminals into the antenna radiator 10, the matching state of the antenna can be flexibly switched along with the working frequency/frequency band, and the antenna radiator 10 can be flexibly switched along with the working frequency/frequency band.
In the reconfigurable antenna provided by the embodiment, by introducing the first active switchable matching network 60 and the second active switchable matching network 61 … …, the nth active switchable matching network 6n, the matching state of the antenna is flexibly switched along with the working frequency/frequency band, and the bandwidth of the antenna is improved as much as possible; and a scheme of flexibly switching a plurality of different feed ends 30 of the antenna is introduced, so that the state of the radiating body of the antenna is also flexibly switched along with the working frequency/frequency band, and the dependence on the physical shape of a specific radiating body (namely antenna pattern debugging) is eliminated to the maximum extent. The reconfigurable antenna provided by the embodiment can be adjusted from two debugging dimensions of an antenna matching state and an antenna radiator state, so that the reconfigurable antenna can be flexibly switched along with the working frequency/frequency band, the resonant frequency of the antenna can be more flexibly and easily switched/deviated along with the working frequency/frequency band, and the range is wider, so that under the same antenna environment condition, compared with the existing active antenna technology, the ultra-wideband frequency band coverage range is realized, and the antenna impedance matching and the antenna efficiency are more ideal.
The embodiment also provides a mobile terminal, and the mobile terminal is provided with a reconfigurable antenna. The reconfigurable antenna can eliminate the dependence on the physical shape of the radiator (namely, the antenna pattern) to the maximum extent, provides a possible realization way for realizing the simplification and even standardization of the antenna radiator 10, also provides possibility for really realizing one-board sizing of the antenna radiator 10 in the product development process, and particularly provides a good cut-in for realizing the antenna performance and the bandwidth of all-metal shell mobile phone/flat plate products. For a relatively arbitrary antenna radiator shape, for example, a simple and slender conductor (which may be an iron sheet, an FPC, a wire, etc.) is used as the antenna radiator 10 on the mobile terminal of the metal housing, in this case, the first feeding ground switching end 50, the second feeding ground switching end 51 … …, the nth feeding ground switching end 5n, which are selected to be suitable positions, are used as the actual feeding end 30, so as to correspond to a plurality of different antenna radiator states, and achieve a desired initial resonant frequency of the antenna and an optimally-matchable impedance interval within a plurality of main frequency ranges, and the effect is better than or equivalent to that by adjusting a specific radiator physical shape (i.e., antenna pattern) of the antenna radiator 10, the desired initial resonant frequency of the antenna and the optimally-matchable impedance interval within the plurality of main frequency ranges are achieved. Meanwhile, the reconfigurable antenna can eliminate the physical shape of the radiator (namely, the antenna pattern) to the maximum extent, and has more advantages in realizing the performance and bandwidth of the antenna on mobile terminals such as mobile phones/flat products with all-metal shells, and the like, because the great difficulty in manually modifying and debugging the metal shells and the great time and cost are required for changing and proofing the molds are involved, when the segmented metal shells are directly used as the antenna radiator, only one plate is used for sizing, and the physical shape of the radiator (namely, the antenna pattern) cannot be debugged.
The reconfigurable antenna provided by the present embodiment is further described below with reference to fig. 9 to 12. The basic size and layout information of the reconfigurable antenna are as follows:
the antenna main floor 11, i.e., Printed wire Board group, has a length of 130mm, a width of 76mm, and a thickness of 1 mm). The antenna clearance, namely the space between the antenna and the main antenna floor 11, is 9mm in length, 76mm in width and 1mm in thickness, and the antenna clearance is filled with a dielectric substrate with a relative dielectric constant of 4.4 and a loss tangent of 0.02. The antenna radiator 10 is arranged coplanar with the antenna main floor 11, and has a transverse length of 56mm and a line width of 2 mm. The first feeding ground switching end 50 and the second feeding ground switching end 51 … …, the nth feeding ground switching end 5n, the longitudinal length and the line width of which are 7mm and 1mm respectively, are respectively led out from three different positions (such as 0mm, 20mm and 40mm positions from the left) of the antenna radiator 10, and the first feeding ground switching end 50 and the second feeding ground switching end 51 … …, the nth feeding ground switching end 5n are respectively connected with the first antenna switch 80 and the nth antenna switch 8n of the second antenna switch 81 … … on the antenna main floor 11.
In fig. 9, the first antenna switch 80 is a single pole, four throw switch; input terminal s of first antenna switch 801Is a common input terminal connected to the first feed-ground switching terminal 50; the four output terminals of the first antenna switch 80 are a1，a2，a3，a4. Wherein the output terminal a1Connected to a first passive matching network 90; output terminal a2，a3，a4Respectively followed by inductors L arranged in parallel in the first active switchable matching network 601(40nH)、L2(20nH)、L3(10nH) in this embodiment, the first passive matching network 90 is an L-type passive matching network, the L-type passive matching network including a first inductor L12And a second inductor L13A first inductor L12Two ends of which are respectively connected with the first antenna switch 80 and the change-over switch 70, and a second inductor L13Is connected to the first inductor L12And the other end of the switch 70 is grounded.
In fig. 9, the second antenna switch 81 is a single-pole four-throw switch; input terminal s of second antenna switch 812Is a common input end and is connected with a second feeding ground feed switching end 51; the four output terminals of the second antenna switch 81 are b1，b2，b3，b4. Wherein the input terminal s2Connected to a second passive matching network 91; output terminal b2，b3，b4Respectively followed by inductors L arranged in parallel in the second active switchable matching network 614(500nH)、L5(75nH) and L6(35 nH). in the embodiment, the second passive matching network 91 is an L-type passive matching network, the L-type passive matching network comprises a third inductor and a capacitor, two ends of the capacitor are respectively connected with the second antenna switch 81 and the change-over switch 70, and a fourth inductor L14One end of (8nH) is connected between the capacitor and the second antenna switch 81, and the other end is grounded.
In fig. 9, the nth antenna switch 8n is a single-pole four-throw switch; input terminal s of nth antenna switch 8nnIs a common input end and is connected with an nth feed ground feed switching end 5 n; the output terminals of the nth antenna switch 8n are c1，c2，c3，c4. Wherein, the output terminal c of the nth antenna switch 8n1，c2，c3，c4Respectively followed by inductors L arranged in parallel in an n-th active switchable matching network 6n7(150nH)，L8(35nH)，L9(25nH)，L10(15nH)。
In fig. 9, the change-over switch 70 is a single-pole double-throw switch; input terminal s of the changeover switch 704Connected to an input/output port 20 (i.e. a feed) of the radio frequency front end, the output terminal d thereof1And d2Connected to a first passive matching network 90 and a second passive matching network 91, respectively.
The operation of the reconfigurable antenna is further described as follows:
corresponding to the state S of the antenna radiator in the frequency range f1 (600-1300 MHz)L1Of the single-pole double-throw typeInput terminal s of the changeover switch 704Always towards the output end d1(ii) a Input terminal s of single-pole four-throw first antenna switch 801Always towards the output end a1(ii) a Input terminal s of single-pole four-throw second antenna switch 812Always do not hit the output end b1In this frequency interval, six sub-frequency intervals f11, f12, f13, f14, f15 and f16 are further divided, and the switching state combination of the second antenna switch 81 and the third antenna switch 82 is further controlled on each sub-frequency interval, so that the state of ground loading matching in this antenna radiator state is changed or switched, and the antenna resonant frequency is shifted between the sub-frequency intervals, so as to cover the whole frequency range f1 (600-1300 MHz), and the simulated R L (i.e. Return L oss, reflected standing wave ratio) result is as shown in fig. 10:
when the input terminal s2 of the second antenna switch 81 is turned to the output terminal b2, and the input terminal s of the n-th antenna switch 8n is turnednTowards the output terminal c1, the effective band is centered at 700-804 MHz;
when the input terminal s2 of the second antenna switch 81 is turned to the output terminal b3, and the input terminal s of the n-th antenna switch 8n is turnednTowards the output terminal c1, the effective band is concentrated at 804-908 MHz;
when the input terminal s2 of the second antenna switch 81 is turned to the output terminal b4, and the input terminal s of the n-th antenna switch 8n is turnednTowards the output terminal c1, the effective band is concentrated at 908-976 MHz;
when the input terminal s2 of the second antenna switch 81 is turned to the output terminal b2, and the input terminal s of the n-th antenna switch 8n is turnednTowards the output terminal c2, the effective band is centered at 976-1056 MHz;
when the input terminal s2 of the second antenna switch 81 is turned to the output terminal b3, and the input terminal s of the n-th antenna switch 8n is turnednTowards the output terminal c2, the effective band is concentrated at 1056-1136 MHz;
when the input terminal s2 of the second antenna switch 81 is turned towards the output terminal b4, andinput terminal s of nth antenna switch 8nnTowards the output c2, the effective band is centered at 1136 and 1216 MHz.
Corresponding to the state S of the antenna radiator in the frequency range f2 (1300-3500 MHz)L2Input terminal s of single-pole double-throw change-over switch 704Always towards the output end d2(ii) a Input terminal s of single-pole four-throw second antenna switch 812Always towards the output end b1(ii) a Input terminal s of single-pole four-throw first antenna switch 801Always not to output a1The equivalent length of an antenna radiator is the optimal antenna radiator state for a high frequency band, and in the frequency interval, four sub-frequency intervals of f21, f22, f23 and f24 are further divided, the switching state combination of the first antenna switch 80 and the nth antenna switch 8n is further controlled on each sub-frequency interval, so that the ground loading matching state in the antenna radiator state is changed or switched, the antenna resonant frequency is shifted between the sub-frequency intervals, the whole frequency range f2 (1300-3500 MHz) is covered, and the simulated R L (namely Return L oss, reflected standing wave ratio) result is as shown in FIG. 11:
when the input terminal s of the first antenna switch 801To the output terminal a2, input terminal s of the n-th antenna switch 8nnTowards c3, the effective band is concentrated at 1216-1336 MHz;
when the input terminal s of the first antenna switch 801To the output terminal a2, input terminal s of the n-th antenna switch 8nnTowards c4, the effective frequency band is concentrated at 1366-2500 MHz;
when the input terminal s of the first antenna switch 801To the output terminal a3, input terminal s of the n-th antenna switch 8nnTowards c4, the effective band is centered at 2500 + 3864 MHz;
when the input terminal s of the first antenna switch 801To the output terminal a4, input terminal s of the n-th antenna switch 8nnTowards c4, the effective band is centered at 3864-3500 MHz.
The results of simulation debugging in the frequency range f1(600 to 1300MHz) and the frequency range f2(1300 to 3500MHz) respectively correspond to fig. 10 and fig. 11, and the processing results in fig. 10 and fig. 11 are combined, so that it can be seen that the bandwidth of the antenna can realize an ultra-wideband coverage of 600 to 3500MHz, as shown in fig. 12.
While the invention has been described with reference to several particular embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A reconfigurable antenna is characterized by comprising an input/output port at the front end of a radio frequency, a change-over switch connected with the input/output port, an antenna radiator, at least three feed ground feed change-over ends arranged on the antenna radiator, an antenna switch connected with each feed ground feed change-over end, and an active switchable matching network connected with each antenna switch; the change-over switch is connected with at least three antenna switches;
the change-over switch is used for switching at least three antenna switches to be connected with the input/output port; each antenna switch is used for switching the switch or the active switchable matching network connected with the antenna switch to be connected with the feed ground switching end; the feed ground feed switching end is a feed end when communicated with the input/output port of the radio frequency front end, and is a ground feed end when not communicated with the input/output port of the radio frequency front end.
2. The reconfigurable antenna of claim 1, wherein the switch is a single-pole multi-throw switch, a common input terminal of the switch being connected to the input-output port; and the multi-path output end of the change-over switch is respectively connected with at least three antenna switches.
3. The reconfigurable antenna of claim 1, wherein the antenna switch is a single-pole multi-throw switch, and a common input terminal of the antenna switch is connected to the feed-to-ground switching terminal; one output end of the antenna switch is connected with the change-over switch, and the other output ends of the antenna switch are connected with the active switchable matching network.
4. The reconfigurable antenna of claim 3, wherein the active switchable matching network comprises a plurality of inductors or capacitors connected in parallel, each of the inductors or capacitors being connected to one of the remaining outputs of the antenna switch.
5. The reconfigurable antenna of claim 1, wherein at least three of the feed-fed switching terminals are spaced apart on the antenna radiator.
6. The reconfigurable antenna of any one of claims 1-5, further comprising a passive matching network connected between each of the switches and the antenna switch.
7. The reconfigurable antenna of claim 6, wherein the passive matching network comprises an L-type passive matching network, a T-type passive matching network or a pi-type passive matching network.
8. The reconfigurable antenna of claim 7, wherein the L-type passive matching network comprises a first inductor and a second inductor, two ends of the first inductor are respectively connected with a change-over switch and an antenna switch, one end of the second inductor is connected between the first inductor and the change-over switch, and the other end of the second inductor is grounded.
9. The reconfigurable antenna of claim 7, wherein the L-type passive matching network comprises a third inductor and a capacitor, two ends of the capacitor are respectively connected with a selector switch and an antenna switch, one end of the third inductor is connected between the capacitor and the antenna switch, and the other end of the third inductor is grounded.
10. A mobile terminal, characterized in that it comprises a reconfigurable antenna according to any of claims 1 to 9.
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| CN107959120B (en) * | 2016-10-17 | 2020-07-10 | 比亚迪股份有限公司 | Reconfigurable antenna and mobile terminal |
| CN110336113B (en) * | 2019-05-09 | 2021-07-20 | 天通凯美微电子有限公司 | Reconfigurable antenna and display screen component integrated electronic equipment |
| CN111525265B (en) * | 2020-05-22 | 2022-02-01 | 闻泰通讯股份有限公司 | Antenna tuning system, electronic equipment and antenna tuning method |
| CN114069228B (en) * | 2020-08-07 | 2023-08-22 | 华为技术有限公司 | Antenna power supply system and electronic equipment |
| CN112086746A (en) * | 2020-09-04 | 2020-12-15 | Tcl通讯（宁波）有限公司 | Structure and method for expanding antenna bandwidth and mobile terminal |
| CN112103623A (en) * | 2020-09-10 | 2020-12-18 | 惠州Tcl移动通信有限公司 | Multi-feed-point antenna and mobile terminal thereof |
| CN113161339B (en) * | 2020-12-22 | 2023-02-28 | 国网河北省电力有限公司雄安新区供电公司 | Chip and control method implemented based on chip |
| CN115549640B (en) * | 2022-12-01 | 2023-02-03 | 深圳市恒运昌真空技术有限公司 | Impedance matching system for radio frequency power supply and impedance matching adjusting method |
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